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Support Article

Poor performance loading application dashboard



One application is having a significant performance problem loading the dashboard when users log into the system. Response time is multi-minute, making the application virtually unusable. 

Error Messages

2015-06-08 09:50:47,077 [ WebContainer : 11] [ ] [ ] (ngineinterface.service.HttpAPI) ERROR|xxx.x.x.x - xxx.x.x.x: Unable to synchronize on requestor H01BC0CDB57C67B62159C084791C8AD64 within 120 seconds: (thisThread = WebContainer : 11) (originally locked by = WebContainer : 50) (finally locked by = WebContainer : 50)

at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(
at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(
at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(
at com.pega.pegarules.session.internal.engineinterface.service.HttpAPI.invoke(
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(
at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(

Steps to Reproduce

Log in to the application and time how long it takes the dashboard to load.

Root Cause

The root cause of this problem is defect/misconfiguration in the operating environment.


This issue is resolved by making the following change to the operating environment:

Oracle database statistics were regenerated and were no longer pinned for a set of work tables accessed during login and the display of the user dashboard. Re-pin the table statistics to allow the Oracle query optimizer to use indexes correctly and restore normal performance. 
Suggest Edit

Published July 2, 2015 - Updated October 8, 2020

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